69 GMC C20 Core support repair or replace

[MYOUNG]

My current core support is rusted out on both sides as the truck came with dual batteries. The main mounting points are pretty bad also but the top 2/3 of the core support is in good condition. My question is basically is it better to get a cheaper Chevy core support and cut the bottom off and weld it to my current one or should I drop the extra cash and get the GMC specific one from GMC Pauls and just swap it out.

I have heard that the reproduction ones dont fit as well but I dont know where specifically the issues with the fit are.

Since the bottom of the core support is the same I think it could work but it might not be worth the work if the reproduction one is a good fit.

Has anyone here welded 2 core supports together to make one good one?? I was thinking I could cut it right at the bottom of the opening for the radiator to make the cuts shorter??